14yr old daughter is out of control...

i have 7 children from 3 to 16yrs old. my 14yr old daughter is out of control. everytime she is asked to clean up after herself or do anything she starts off crying which leads to abuse. she swears and calls names, says terrible things to her siblings like they are fat and ugly and that i dont love them. she says she hopes i die in an accident and screams uncontrollably like she is being murdered for hours. she follows me around the house ranting and wont stay in her room, and when she is in her room she smashes holes in the wall. she gets physically violent hitting me with objects and has attacked her stepfather. these outbursts can last for days non stop. we had her admitted to a mental health unit at one stage for 3 days and they said she has possible odd. the last episode we called the police and she told them we abuse her and other terrible things, she is quite an actress and i am not sure if they believed us. she hasnt gone to school! for nearly a year claiming she cant as she gets picked on and the school end up calling me to take her home as she is hysterical in the office and unreasonable. she ended up beating the head bully but still says she cant go to school. the only thing she is disciplioned with is her dancing which she does 3 or 4 days a week. she is quite good. last outburst i had enough as i was bruised and sore and couldnt take any more so i took her phone and playstation (after repeated warning) and threw them away. she screamed so badly the nieghbours complained. i then told her dance teacher she will not be going to her concert and why. my daughter is devistated they know and said she will never face them again and wishes she was dead as she has nothing to live for. did i do the right thing? i think i should see how her behaviour goes and let her dance the concert. i dont know what to do as this is affecting my whole family and my 16yr old wants to leave home because of this.